How to add elements to an array in python

In Python, there are four ways to add elements to a list: use the append() method to append to the end; use the extend() method to add elements of another iterable object; use the insert() method to add elements to the list. Insert at specified position; uses index assignment (but will throw an exception if index is out of range).

How to add elements to a Python array

In Python, an array is called a list. Adding elements to the list is very simple, there are several methods:

1. append() method

append() method adds elements to the end of the list. The syntax is as follows:

<code class="python">list.append(element)</code>

For example:

<code class="python">my_list = [1, 2, 3]
my_list.append(4)
print(my_list)  # 输出：[1, 2, 3, 4]</code>

2. extend() method

extend() method extends another list or tuple The element is added to the end of the original list. The syntax is as follows:

<code class="python">list.extend(iterable)</code>

where iterable can be a list, tuple or other iterable object. For example:

<code class="python">my_list = [1, 2, 3]
my_list.extend([4, 5, 6])
print(my_list)  # 输出：[1, 2, 3, 4, 5, 6]</code>

3. insert() method

insert() method adds an element to the specified position in the list. The syntax is as follows:

<code class="python">list.insert(index, element)</code>

where index represents the position where the element is to be inserted. For example:

<code class="python">my_list = [1, 2, 3]
my_list.insert(1, 4)
print(my_list)  # 输出：[1, 4, 2, 3]</code>

4. Index assignment

Index assignment can also be used to add elements to a list, but if the index exceeds the range of the list, an IndexError exception will be raised. The syntax is as follows:

<code class="python">list[index] = element</code>

For example:

<code class="python">my_list = [1, 2, 3]
my_list[3] = 4
print(my_list)  # 输出：[1, 2, 3, 4]</code>

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